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ow_globals.jal
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ow_globals.jal
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--
-- $Id: ow_globals.jal,v 1.3 2014/01/01 03:06:09 cvsusers Exp $
--
-- Global arrays and records used by the one_wire routines.
--
const bit OWDEBUG = TRUE; -- Enable One-Wire debug messages & LEDs.
const byte MAXDEVICES = 4; -- The maximum number of devices we can handle.
const byte SN_LENGTH = 8; -- The length of the device serial number (bytes).
record devinfo is
byte sn[SN_LENGTH]; -- Device serial number.
byte loc[SN_LENGTH]; -- Location string (limited to 8 bytes to save EEPROM space).
byte tlsb; -- Temperature least-significant byte (not saved to EEPROM).
byte tmsb; -- Temperature most-significant (sign) byte (not saved to EEPROM).
end record
const byte rec_sz = SN_LENGTH + SN_LENGTH;-- Record size used to accomodate sensor data in EEPROM.
var volatile devinfo FamilySN[MAXDEVICES]; -- Identifier info for devces on the one-wire bus
-- (the original Dallas API uses a two-dimensional
-- array for this information).
var volatile byte LastDiscrepancy = 0;
var volatile byte LastFamilyDiscrepancy = 0;
var volatile bit LastDeviceFlag = FALSE;
var volatile byte ROM_NO[SN_LENGTH]; -- Temporary storage for a single serial number.
var volatile byte DevCount = 0; -- Count of number of devices found during search routine.
-- Global CRC variables.
------------------------
var bit utilcrc16;
var byte crc8, utilcrc8;
const byte oddparity[16] = { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 };
const byte dscrc_table[] = {
0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53 };
-- One-Wire ROM Commands.
-------------------------
const byte SEARCH_ROM = 0xF0;
const byte READ_ROM = 0x33;
const byte MATCH_ROM = 0x55;
const byte SKIP_ROM = 0xCC;
const byte ALARM_SEARCH = 0xEC;
-- One-Wire Device Specific Function Commands.
----------------------------------------------
const byte T_CONVERT = 0x44; -- Temperature convert.
const byte WRITE_SPAD = 0x4E; -- Write device scratch-pad memory.
const byte READ_SPAD = 0xBE; -- Read device scratch-pad memory.
const byte COPY_SPAD = 0x48; -- Copy contents of device scratch-pad to device EEPROM.
const byte RECALL_SPAD = 0xB8; -- Recall device EEPROM contents back into scratch-pad memory.
const byte READ_PSU = 0xB4; -- Read device power requirements.